The Kinetics of the Water Gas Conversion. III. Influence of H2S on the Rate Equation.

Water–Gas Shift Kinetics Over FeCr-based Catalyst: Effect of Hydrogen Sulphide

“…In sweet and sour WGS, the presence of H 2 S in the feed first of all reduces the catalyst activity, reflected by a negative exponent n H 2 S [18][19][20]. Secondly, the reaction orders for the other species may also be affected [18].…”

“…Secondly, the reaction orders for the other species may also be affected [18]. However, the number of investigations concerning the effect of H 2 S on FeCr-based catalysts is limited and more specifically, detailed reports of the effect of small amounts of H 2 S (sweet shift) are few-while this is crucial for the development of pre-combustion CCS processes.…”

“…For a narrow range of conditions, literature suggests that the observed reaction kinetics for either clean, sweet, or sour syngas can be described with sufficient accuracy using a power rate law expression [14,15,18]: …”

“…In the 1960s, Bohlbro published a series of papers on the kinetics of WGS over commercial FeCr-based WGS catalysts [18,[21][22][23], one of which specifically concerned the influence of H 2 S on the rate equation [18]. WGS kinetics was measured with 75 and 2,000 ppmv of H 2 S in the reactor feed.…”

“…This effect, however, was not quantified. In the range of 30-100 ppmv of H 2 S at 380°C and atmospheric pressure, Bohlbro [18] observed that the reaction rate decreased according to:…”